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Note to Windows users that FreeType will keep the font file open #6485

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Aug 7, 2022
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Note to Windows users that FreeType will keep the font file open #6485

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Note to Windows users that FreeType will keep the font file open
radarhere Aug 6, 2022
c24b6ef
Document workaround
radarhere Aug 6, 2022
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8 changes: 5 additions & 3 deletions src/PIL/ImageFont.py
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Expand Up @@ -906,10 +906,12 @@ def truetype(font=None, size=10, index=0, encoding="", layout_engine=None):
This function loads a font object from the given file or file-like
object, and creates a font object for a font of the given size.

Pillow uses FreeType to open font files. If you are opening many fonts
simultaneously on Windows, be aware that Windows limits the number of files
that can be open in C at once to 512. If you approach that limit, an
Pillow uses FreeType to open font files. On Windows, be aware that FreeType
will keep the file open as long as the FreeTypeFont object exists. Windows
limits the number of files that can be open in C at once to 512, so if many
fonts are opened simultaneously and that limit is approached, an
``OSError`` may be thrown, reporting that FreeType "cannot open resource".
A workaround would be to copy the file(s) into memory, and open that instead.

This function requires the _imagingft service.

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